I have a stock 2009 3500 4x4 6 speed manual with 6. 7 L motor. The truck has 13K miles on it. I primarily use it for hauling horses or hay. The truck almost always has a trailer behing it. About 200 miles ago I heard a chime and looked up at the console it said "Air Filter Service". So I bought a Baldwin Filter and replaced it. I found nowwhere in the book about having to perform a reset or anything. Next time I started the truck the message was gone. This weekend as I was hauling my horses The chime went again and I looked up. The same message was displayed. When I replaced the original filter the filter was very black along the bottom. Anybody have any thoughts on this. I have the dealer looking at it today however I am leaving for a 7 hour haul Thursday and I do not want to be stranded hauling horses.